Etymology

ferrocerium

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Today it means: A pyrophoric alloy of iron and cerium that is used with a striker (a steel) to make the spark of a lighter or firestarter. Full definition →

English cerium ← Latin ferrum ← Old Latin *fersom
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The story

  1. Old Latin*fersom
  2. Latinferrum
  3. Englishferro-
  4. Englishcerium
  5. English todayferrocerium

From ferro- + cerium.

Etymology from Wiktionary, CC BY-SA 4.0.